package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.DishVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishMapper dishMapper;

    /*
    * 分页查询
    * */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        //1.开始分页查询--PageHelper
        PageHelper.startPage(setmealPageQueryDTO.getPage(),setmealPageQueryDTO.getPageSize());

        //2.调用Mapper执行分页查询-pageHelper固定的返回值Page<实体>---VO实体类用于展示页面数据
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);

        //3.获取pageSize里面的两个参数:total,records
        return new PageResult(page.getTotal(),page.getResult());
    }


    /*
    * 新增套餐
    * */
    @Override
    public void saveWithDish(SetmealDTO setmealDTO) {
        //1.拷贝属性
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);

        //2.向套餐表插入数据
        setmealMapper.insert(setmeal);

        //3.获取生成的套餐id
        Long setmealId = setmeal.getId();

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmealId);
        }

        //4.保存套餐和菜品的关联关系
        setmealDishMapper.insertBatch(setmealDishes);
    }


    /*
    * 批量删除套餐
    * */
    @Override
    public void delete(List<Long> ids) {
        for (Long id : ids) {
            //根据id查询套餐
            Setmeal setmeal = setmealMapper.getById(id);
            if (setmeal.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }

        //根据id删除套餐表中的数据
        for (Long setmealId : ids) {
            setmealMapper.deleteById(setmealId);

            //根据id删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(setmealId);
        }
    }


    /*
    * 根据id查询套餐和关联菜品数据
    * */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        //1.根据id查询套餐数据
        Setmeal setmeal = setmealMapper.getById(id);

        //2.根据套餐id查询菜品数据
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        //3.将查询到的数据封装到VO
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal,setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);

        return setmealVO;
    }



    /*
    * 修改套餐
    * */
    @Override
    public void update(SetmealDTO setmealDTO) {
        //1.转实体
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);

        //2.修改套餐表，执行update
        setmealMapper.update(setmeal);

        //3.删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete
        setmealDishMapper.deleteBySetmealId(setmeal.getId());

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmeal.getId());
        }

        //4.重新插入套餐和菜品的关联关系，操作setmeal_dish表，执行insert
        setmealDishMapper.insertBatch(setmealDishes);
    }



    /*
    * 套餐起售、停售
    * */
    @Override
    public void startOrStop(Integer status, Long id) {
        //3.起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if (status == StatusConstant.ENABLE){
            List<Dish> dishes = dishMapper.getBySetmealId(id);
            //如果套餐中包含菜品
            if (dishes != null && !dishes.isEmpty()){
                for (Dish dish : dishes) {
                    //只要有一个菜品是“停售”状态，就不能启售套餐
                    if (dish.getStatus() == StatusConstant.DISABLE){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                }
            }
        }
        //1.构造一个setmeal对象用来保存修改的结果
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();

        //2.调用mapper修套餐的起售停售
        setmealMapper.update(setmeal);

    }

    /*
    * 根据分类id查询起售的套餐
    * */
    @Override
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }


    /*
    * 根据套餐id查询包含的菜品
    * */
    @Override
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
